A fuse?

[Serum]

Do not use fuses. They can harm your controller (blow it up) when the controller looses connection with the batteriepack. (the reason all the schulzes die is because of a loose connection) when you brake, the energy is stored back in to the batteries, (it uses the low internal resistance of the batteries to brake) once the connection with these batteries is lost, the energy can no longer be stored and it is very likely it kills the controller.

I don't know what a controller does when it looses power though, but if it looses RC it brakes as hard as it can.

I would never put my controller in that risc of a fuse. (how odd does that sound?)